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Income taxes - Schedule of Net Deferred Tax Position (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Income Tax Disclosure [Abstract] |  |
Deferred income tax assets, net | $ 8,644 | $ 11,058
Deferred income tax liabilities, net | 16,813 | 6,546
Deferred tax assets, net | $ (8,169) | $ 4,512

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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